N,n1-disubstituted benzamidines

ABSTRACT

WHEREIN R is lower alkyl, cycloalkyl, phenyl, naphthyl, pyridyl, or substituted phenyl, R&#39;&#39; is hydrogen, lower alkyl, lower alkoxy, or halogen, IS DIALKYLAMINO OR A HETEROCYCLIC RING, N IS AN INTEGER FROM 24, AND X is oxygen or sulfur, possess hypoglycemic activity.   Compounds of the formula

O United States Patent 1 51 3,669,974 Elpern et al. 145; June 13, I972 4] N,N l -DISUBSTITUTED BENZAMIDINES Primary Examiner-Henry R. Jiles Assistant E.ram|'nerS. D. Winters [72] Inventors. mhgeylilams, James R. Shrofl, y E Tenenbaum {73] Assignee: USV Pharmaceutical Corporation [57] ABSTRACT [22] Filed: March 25, 1971 Compounds of the formula [2]] Appi. No.1 128,125 2 n Related us. Application Data 11' H [63] Continuation-impart of Ser. No. 845,030, July 25,

1969, abandoned. I

RI! 152] US. Cl. ..260/293.79, 260/564 R, 260/2948 G,

260/296 AE, 260/2471, 260/2475 R, 260 3265 L,

260/243 260/268 260/2472 260/3263 wherein R is lower alkyl, cycloalkyl, phenyl, naphthy], pyridyl, 260/2948 260/295 260/566 260/296 or substituted phenyl, R is hydrogen, lower alkyl, lower al- 260/57CL7, 260/2955 R Roxy or halogen [51] Int. Cl. ..C07d 29/28 [58] Field of Search ..260/564 R, 294.8 G, 296 AB,

260/247.l, 247.5 R, 326.5 L, 326.84, 293.73, 293.79 K

m [56] References Cited UNITED STATES PATENTS is diulkylamino or a heterocyclic ring, :1 is an integer from 24,

and X is oxygen or sulfur, possess hypoglycemic activity. 3,462,446 8/l969 De Wald 260/296 AE 7 Claims, N0 Drawings N,N l-DISUBSTITUTED BENZAMIDINES This application is a continuation-in-part of our copending application Ser. No. 845,030, filed July 25, l969, now abandoned.

This invention relates to new organic compounds having valuable pharmacological activity and to processes for the preparation ofsaid compounds. In particular, the invention relates to benzamidines of the formula X(CH2)N wherein:

R is lower alkyl, cycloalkyl, phenyl, naphthyl, pyridyl, or substituted phenyl;

R is hydrogen, lower alkyl, lower alkoxy, or halogen;

R" and R' are lower alltyl, phenyl or phenyl-lower alkyl and may be the same or different, or when taken together with the nitrogen to which they are attached may be heterocyclic such as morpholino, thiamorpholino, pyrrolidino, piperidino, piperazino, N-methylpiperazino and the like;

X is oxygen or sulfur; and

n is an integer from 2 to 4 inclusive; and their pharmaceutically acceptable, non-toxic monoand diacid addition salts.

The lower alkyl and lower alkoxy groups contain from one to five carbon atoms and may be straight-chained or branched.

The substituted phenyl carries one or more substitutents such as lower alkyl, lower alkoxy, lower alkyl-mercapto, halogen such as bromo, chloro-, fluoroor iodo-, and trifluoromethyl.

The cyaloalkyl groups contain from five to seven atoms in the ring which may be substituted with lower alkyl groups.

Preferably, R is phenyl or substituted phenyl such as methoxyphenyl or dimethylphenyl, R is hydrogen, R" and R' taken together with the nitrogen to which they are attached is di-(lower alkyl)-amino, pyrrolidino or piperidino, n is 2 or 3, X is oxygen, and the is attached to ring in a position para to the nitrogen of the amidine group.

The pharmaceutically acceptable non-toxic acid addition salts include salts of inorganic acids such as hydrochloric, hydrobromic, sulfuric and phosporic, and organic acids such as acetic, propionic, glycolic, lactic, malonic, succinic, malic, maleic, fumaric, tartaric, citric, ascorbic, benzoic, hydroxybenzoic, aminosalicylic, cinnamic, mandelic, benzenesul' fonic, toluenesulfonic, nicotinic, isonicotinic, and the like.

According to a process of this invention the benzamidines were prepared by reacting in an inert solvent an appropriately substituted benzimidoyl chloride with a desirably substituted aminoalkoxyaniline or aminoalkylmercapto-aniline. The resulting hydrochloride was converted to the free base by treatment with ammonia, which free base could then be converted to the desired acid addition salts.

The intermediate benzimidoyl chlorides were prepared from benzoyl chloride and a desired amine under standard Schotten-Baumann procedure to form the N-substituted benzamide which was converted to the benzimidoyl chloride by treatment with SOC! or PCL, according to published procedures.

The aminoalkoxyanilines were prepared by the reduction of aminoalkoxy-nitrobenzenes which were obtained by the reaction of the sodium salt of a nitrophenol with an aminoalkyl chloride.

The intermediate animoalkylmercapto-anilines were prepared by contacting an aminothiophenol with an appropriately substituted aminoalkyl chloride dihydrochloride in the presence of sodium and ethanol according to the procedure published in J. Med. Chem. 7, 376( I964).

The compounds according to the present invention were also obtained by the reaction in the presence of sodium hydride of an appropriately substituted hydroxyphenylbenzamidine of the formula XII with an amino-alkyl chloride of the formula CHO II!) "N wherein R, R, R", R', X and n are same as above.

The invention will be more fully illustrated in the examples which follow, which examples are given by way ofillustration and are not to be considered as limiting.

EXAMPLE I a. N'-Phenyl-N-(4 Hydrochloride To a suspension of270 g. (2.5 mol) p-aminophenol in 2,700 cc. acetone. was added, while stirring, 540 g. (25 mol) N- phenyl benzimidoyl chloride dissolved in 250 cc. acetone. The reaction was exothermic and the temperature rose to 55C. After the addition was complete, the reaction mixture was refluxed for 30 minutes. The reaction mixture was cooled to 15C. and filtered. Recrystallization from methanol-water yielded 353.4 g. of product melting at 289-9 ["C.

b) N '-Phenyl-N-[4-( Z-pyrrolidinoethoxy )phen yl lbenzamidine Dihydrochloride To a suspension of 99.7 g. sodium hydride (60 percent) in 470 cc. dry, distilled dimethylformamide, was added 353.4 g. (L09 mol1N'-phenyl-N-(4-hydroxyphenyl-benzamidine HCl over a period of l hr. in the presence of nitrogen gas. The reaction temperature was maintained between 6070C. by means of an ice bath. When the addition was complete, the temperature of the reaction mixture was elevated to l00l [0 C., and a solution of l86.2 g. (L43 mol) fipyrrolidyl-ethyl chloride in 3 l0 cc. toluene was added dropwise to the reaction mixture. The reaction mixture was heated to l200C. for a period of 8 hrs. and then cooled. The sodium chloride was filtered off and the solvents removed from the filtrate. The residue was extracted with ether, washed with water and dried over anhyd MgSO To the dry ether solution HCl gas was bubbled up in to form the dihydrochloride salt. Recrystallization from isopropanol-acetone yielded 320 g. of product melting at l56l58C.

hydroxy-phenyl )benzamidine EXAMPLE ll N-phenyl-N[4-(Z-pyrrolidinoethoxy)phenyl]-benzamidine Dihyrochloride.

To a solution of lO.75 g. (0.05 mol) Nphenyl-benzimidoyl chloride in cc. dry acetonitrile was added l0.3 g. (0.05 mol) p-[B-( l-pyrrolidyl)ethoxy]aniline, dissolved in 100 cc.

acetonitrile. The reaction was exothermic and the temperature rose to 43C. The reaction mixture was gradually heated to the reflux temperature while constantly stirring and maintained at this temperature for a period of 8 hrs. The

to reflux temperature while constantly stirring and maintained at this temperature for a period of 8 hours. The acetonitrile was distilled off and the crude product neutralized with ammonium hydroxide. The organic material extracted with ether.

acetonitrile was distilled off and the crude product neutralized 5 and the ethereal solution dried over anhydrous MgSO.. HCl with ammonium hydroxide. The organic material extracted gas passed through the ether solution and the dihydrochloride with ether, washed with water and dried over anhyd MgSO salt which formed was crystallized from acetonitrile to yield HCl gas was passed through the ether solution and the Producl 2 F yi 8-) Zeno-220 dihydrochloride salt crystallized from ethanol-ethyl acetate to I acc a with the procedures set forth In the above exyield product in 55 percent yield. M.P. -55-IS7 C. amples. the additional compounds as shown in the table below were prepared. in this table, unless indicated otherwise. the EXAMPLE Ill N'-Phenyl-N-[4-( 2-pyrrolidmoethylthio )phenyl /R" benzamidine Dihydrochloride. I l5 *XwHmN To a solution of 1 L2 g. (0.05 mol] pyrrolidinoethylthio-pm aniline in 250 cc. acetonitrile was added 10.75 g. 0.05 mol) N-phenyl benzimidoyl chloride dissolved in 250 cc. acetonitrile. The reaction was exothermic and the temperais attached on the ring in a position para to the amidine ture rose to 48 C. The reaction mixture was gradually heated 20 nitrogen.

R R R" R 7| Et Et 3 El. El. 2 M0 M0 .3 Plperidiiio L! i-Ii' il 2 w A l,

l'yllOlldlnu 3 Et. Et Ei. M .i i-li Hi' .3 MI- Mi! J Moi'pliolliiii 3 lyi'i'olidliio 3 lyi'iolliliiiii ii ii-lliit. ii-liuL i-li' i-l'i' .2

l'lllt'l'ltllllfl .2 EL hit .5 l lt U lldll: .2 M0 Hi 2 lyi'iolidiiiu 3 lyrroliillnii l'yi'rol'idino 2 lyi'rol'idino 1 lyi'rolldlno J i-lr i-Pi- .2 Mt. Et 2 Me Cqll tjll; 2 l'yi'i'olldhio 3 Morpliolliiu 2 Mi- Mi 2 Et El. 3 il ll flllz (JillsUll; 2 Mi- Mi- 2 i-li' l-li' It ili' H'i L l-li l-li 3 l'ipuiidliio 2 llpurldinii 1i lyi'i'olidliiu L lylIOllilltlO 3 lyri'olidliin 3 lyi'i'olidlno 2 lyi'rolidliiu 1i i-li' l li il i-li ili 3 Mi: PM 2 lit. I'll, ll ii-F U-Cfll ll ii-liiii llBlli. ll-F C-(lillq,, ll lyiiulitlliiii 3 Il-F l[ H lyri'iilldliio L. (f ll ll I'll El .2 (?,[I" ll l lt. EL ll 05H. ll ll'i i-ll' .5 ttlllh. ll l'yii'ulidiiiii (J II U ll lyri'olidliiu ii GiH i ll lyi'mlidiiiti l ll iyi-rolliliiio J ii-llLit ii-Biil 2 M0 Mia 15 Plpllldlllfl All Hi .Ml' C lhill 1i i. Et

lyiifllkllllt] .1 Iiperidinn 2 Pll 2 Flt El 3 lipcridiiio 2 EL Et 2 .\li tli ll llll; .5 Et Rt 2 ii-Biit ii-lliii 2 I)! EL 2 lipciidiiiii 2 liperldiiiu Ii Pyi'iolidiiiii '3 R R R' Salt (I) i-lilyrrolldinu Pyrrolidino llperldlno liperidino Me lyrrolidino .2 lyrrolidlnn .5 Plperldino lyrrolidino '1 Min 7 llllre lllirh Me lIlirUq l iperidlno P h lyi'rolidino it Pyrrolldino 3 I h 2 lyrrolidlno P yrrolldino Piperidlno Pyrrolidlno Piperidino 1' yrrolldlno Plperidino P yi'rolidino P yrrolidino Pyrrolldino Plperidino Plperldino uwwhilwisiliwliut Pyrrolidino i-Pr i-Pr 2 11C] 2 IICl l Where no salt is given, the melting point is that of the free basin The amino-alkoxy group is meta to the amino group.

'Iho amlnoalk0xy group is ortho to the amino group 4 CeHn signifies cyclohexyl,

I Boiling point.

is pyrrolidyl showed strong anti-inflammatory activity by the standard carrageenan, cotton pellet and UV erythema tests.

The novel compounds of this invention can be combined with solid or liquid pharmaceutical carriers and formulated into tablets, powders, or capsules or dissolved in suitable solvents for oral and parenteral administration for human or veterinary use.

The amidine nucleus in the novel compounds of this invention can exist in the tautomeric forms and NMR data have established that these forms exist in the presence of each other.

We claim:

1. A compound of the formula R is lower alkyl, cycloalkyl, having from five to seven atoms. phenyl, nuphthyl, pyridyl, or a substituted phenyl wherein LII the substituent is selected from the group consisting of lower alkyl, lower alkoxy, halogen, or trifluoromethyl;

R is hydrogen, lower alkyl, lower alltoxy, or halogen;

R" and R' are lower alkyl, phenyl or phenyl-lower alkyl and may be the same or different or R" and R taken together with the nitrogen to which they are attached may be morpholino, pyrrolidino or piperidino;

X is oxygen or sulfur; and

n is an integer from 2-4 inclusive,

and its pharmaceutically acceptable, non-toxic acid addition salts.

2 A compound according to claim 1, wherein R is phenyl or substituted phenyl,

R is hydrogen,

R" and R" taken together with the N to which they are at tached is di(lower alkyl)amino, pyrrolidino, or piperidino, n is 2 or 3, X is oxygen, and the li" (CH1)|iN group is attached in a position para to the nitrogen of the amidine group.

3, A compound according to claim 2, wherein R is phenyl, R is hydrogen, R" and R' are isopropyl, and n is 2. 4 A compound according to claim 2, wherein R is phenyl, R is hydrogen, R" and R' are isopropyl, and n is 3v 54 A compound according to claim 2, wherein R is p-methoxyphenyl, R is hydrogen,

is pyrrolidino, and

n is 3 7. A compound according to claim 2 wherein R is 2,3-dimethyl-phenyl. R is hydrogen.

10 is piperidyl. and

n is 3. 

2. A compound according to claim 1, wherein R is phenyl or substituted phenyl, R'' is hydrogen, R'''' and R'''''' taken together with the N to which they are attached is di-(lower alkyl)-amino, pyrrolidino, or piperidino, n is 2 or 3, X is oxygen, and the group is attached in a position para to the nitrogen of the amidine group.
 3. A compound according to claim 2, wherein R is phenyl, R'' is hydrogen, R'''' and R'''''' are isopropyl, and n is
 2. 4. A compound according to claim 2, wherein R is phenyl, R'' is hydrogen, R'''' and R'''''' are isopropyl, and n is
 3. 5. A compound according to claim 2, wherein R Is p-methoxyphenyl, R'' is hydrogen, is pyrrolidino, and n is
 2. 6. A compound according to claim 2, wherein R is phenyl, R'' is hydrogen, is pyrrolidino, and n is
 3. 7. A compound according to claim 2 wherein R is 2,3-dimethyl-phenyl, R'' is hydrogen, is piperidyl, and n is
 3. 